Update public FFmpeg header files from r16647 to r18286.

third_party/ffmpeg/include/libavutil/rational.h

 /*
- * Rational numbers
+ * rational numbers
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * FFmpeg is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with FFmpeg; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file rational.h
- * Rational numbers.
+ * @file libavutil/rational.h
+ * rational numbers
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
 #ifndef AVUTIL_RATIONAL_H
 #define AVUTIL_RATIONAL_H
 
 #include <stdint.h>
 #include "common.h"
 
 /**
- * Rational number num/den.
+ * rational number numerator/denominator
  */
 typedef struct AVRational{
     int num; ///< numerator
     int den; ///< denominator
 } AVRational;
 
 /**
- * Compare two rationals.
+ * Compares two rationals.
  * @param a first rational
  * @param b second rational
- * @return 0 if a==b, 1 if a>b and -1 if a<b.
+ * @return 0 if a==b, 1 if a>b and -1 if a<b
  */
 static inline int av_cmp_q(AVRational a, AVRational b){
     const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
 
     if(tmp) return (tmp>>63)|1;
     else    return 0;
 }
 
 /**
- * Rational to double conversion.
+ * Converts rational to double.
  * @param a rational to convert
  * @return (double) a
  */
 static inline double av_q2d(AVRational a){
     return a.num / (double) a.den;
 }
 
 /**
- * Reduce a fraction.
+ * Reduces a fraction.
  * This is useful for framerate calculations.
- * @param dst_nom destination numerator
+ * @param dst_num destination numerator
  * @param dst_den destination denominator
- * @param nom source numerator
+ * @param num source numerator
  * @param den source denominator
- * @param max the maximum allowed for dst_nom & dst_den
+ * @param max the maximum allowed for dst_num & dst_den
  * @return 1 if exact, 0 otherwise
  */
-int av_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max);
+int av_reduce(int *dst_num, int *dst_den, int64_t num, int64_t den, int64_t max);
 
 /**
  * Multiplies two rationals.
- * @param b first rational.
- * @param c second rational.
- * @return b*c.
+ * @param b first rational
+ * @param c second rational
+ * @return b*c
  */
 AVRational av_mul_q(AVRational b, AVRational c) av_const;
 
 /**
  * Divides one rational by another.
- * @param b first rational.
- * @param c second rational.
- * @return b/c.
+ * @param b first rational
+ * @param c second rational
+ * @return b/c
  */
 AVRational av_div_q(AVRational b, AVRational c) av_const;
 
 /**
  * Adds two rationals.
- * @param b first rational.
- * @param c second rational.
- * @return b+c.
+ * @param b first rational
+ * @param c second rational
+ * @return b+c
  */
 AVRational av_add_q(AVRational b, AVRational c) av_const;
 
 /**
  * Subtracts one rational from another.
- * @param b first rational.
- * @param c second rational.
- * @return b-c.
+ * @param b first rational
+ * @param c second rational
+ * @return b-c
  */
 AVRational av_sub_q(AVRational b, AVRational c) av_const;
 
 /**
  * Converts a double precision floating point number to a rational.
  * @param d double to convert
  * @param max the maximum allowed numerator and denominator
- * @return (AVRational) d.
+ * @return (AVRational) d
  */
 AVRational av_d2q(double d, int max) av_const;
 
 /**
  * @return 1 if \q1 is nearer to \p q than \p q2, -1 if \p q2 is nearer
  * than \p q1, 0 if they have the same distance.
  */
 int av_nearer_q(AVRational q, AVRational q1, AVRational q2);
 
 /**
  * Finds the nearest value in \p q_list to \p q.
  * @param q_list an array of rationals terminated by {0, 0}
  * @return the index of the nearest value found in the array
  */
 int av_find_nearest_q_idx(AVRational q, const AVRational* q_list);
 
 #endif /* AVUTIL_RATIONAL_H */